iOS 局部变量 setTag后可在别的地方调用 viewWithTag

//比如在某个方法里设置后
UITextField* testFild=[[UITextField alloc] initWithFrame:CGRectMake(0, 48, 200, 200)];
    testFild.text = @"qingjoin";
    testFild.tag = bbbb;
    [self.view addSubview:testFild];


//在另一个方法里面也可以得到这个值 

UITextField *t = (UITextField*)[self.view viewWithTag:bbbb];
    NSLog(@"ttfftf:%@",t.text);